Hallo,

I noticed a mistake:
in one of my traditional vocabulary lists is the Chengyu 死氣沉沉 included, but Skritter shows it as 死气沉沉, which would be the simplified variation.

Ah, I see it. I've changed the traditional variant for that word to 死氣沉沉.

Thank you. Is it the right way to post stuff like this here on the forum? Can we as users also correct stuff like this ourself?

Definitions you can edit directly and submit as corrections. Traditional variants you can't correct, but usually what you would do is either note the problem using the feedback tab on the lower right of the study screen, if you're there already, or use the contact page (link at the bottom) and tell us what's up. No need for everyone on the forum to see it.